an impressive sanctuary:
Fallout 4 Sanctuary - Album on Imgur
Maybe it's just confirmation bias but I feel like settlements have the exact problems I thought they'd have: No matter how long you spend on them they look like raider encampments. And generally uninspired ones like this look like boring raider encampments.
I don't really want to play Sims: Fallout, but if I did I'd hope that modders:
1. Create a library of pre-war art assets including homes, businesses, factories, landscapes, vegetation etc.
2. Create a meaningful and integrated system to not just build up your small community as a pristine gem of the wasteland, but also integrate other locations and non-settler communities into it. Ex:
2a. I just cleared out a water purification plant yesterday. I'd love it if this could be properly cleaned up and once added to New Boston (my name for the new civilization), it would provide clean water for everywhere that cleaned their pipes, preventing every settlement from needing to build their own little pile of retarded looking water purifiers.
2b. There are a bunch of different factories out there. Each one should provide some subset of manufacturing that use primary resources, ex: steel -> screws/gears/springs. glass>optics/whatever. Enabling them will proliferate a steady supply of those resources to other settlements.
2c. Groups like Diamond City would be integrated through some basic quest system to allay their fears. Some groups would or could be eradicated instead. Failing a speech check with the mayor of diamond city that causes Diamond City security to attack your settlements until you kill the mayor would be excellent.
3. Be able to stop respawns of certain unmarked enemy areas by building enough settlement around them. The closer you get to Boston the more annoying this will be from a technical standpoint.
4. I don't know how settlers work in FO4 but I think it'd be great if instead of them showing up there was a family system that would create babies that turned into kids and then adults ala FOShelter. There's a pretty firm cap of the number of possible NPCs in a given area and that's fine (I know what going over that limit does in Skyrim with certain mods, lol).
5. Be able to delegate scavaging, settling, base building and defense in a much more meaningful way than there is currently.
In the end, you'd be able to create a thriving civilization, not some cookie cutter looking fort that looked like your dad helped you build from some pile of shit you found in the woods.